Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
pcFinancials - Planning, Budgeting, Reporting and Consolidating Solution.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Shoppimon - Shoppimon simulates live shoppers visiting your Magento store and
Better Uptime - We call you when your website goes down
AppNeta - Appneta's award-winning suite of application performance management tools ensure optimized web app, SaaS app and end-user monitoring. See a free demo today.